90e33ee203
methods to detect extended memory didn't work well. (this XMS size is always too small, typically by 68k)
346 lines
8.4 KiB
C
346 lines
8.4 KiB
C
/* $NetBSD: exec_fromdos.c,v 1.6 1997/11/03 18:06:22 drochner Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1996
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* Matthias Drochner. All rights reserved.
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* Copyright (c) 1996
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* Perry E. Metzger. All rights reserved.
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* Copyright (c) 1997
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* Martin Husemann. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)boot.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* starts NetBSD a.out kernel
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* needs lowlevel startup from startprog.S
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* This is a special version of exec.c to support use of XMS.
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*/
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#include <sys/param.h>
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#include <sys/exec_aout.h>
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#include <sys/reboot.h>
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#ifdef COMPAT_OLDBOOT
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#include <sys/disklabel.h>
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#endif
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#include <lib/libsa/stand.h>
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#include "libi386.h"
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#include "bootinfo.h"
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#ifdef COMPAT_OLDBOOT
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static int
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dev2major(devname, major)
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char *devname;
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int *major;
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{
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static char *devices[] = {"wd", "", "fd", "", "sd"};
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#define NUMDEVICES (sizeof(devices)/sizeof(char *))
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int i;
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for (i = 0; i < NUMDEVICES; i++)
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if (!strcmp(devname, devices[i])) {
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*major = i;
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return (0);
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}
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return (-1);
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}
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#endif
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extern struct btinfo_console btinfo_console;
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int
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exec_netbsd(file, loadaddr, boothowto)
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const char *file;
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physaddr_t loadaddr;
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int boothowto;
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{
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register int io;
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struct exec x;
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int cc, magic;
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physaddr_t entry;
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register physaddr_t cp;
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u_long boot_argv[6];
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u_long extmem;
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#ifdef XMS
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u_long xmsmem;
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physaddr_t tmpbuf = 0;
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physaddr_t origadr = 0;
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#endif
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#ifdef COMPAT_OLDBOOT
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char *fsname, *devname;
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int unit, part;
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const char *filename;
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int bootdevnr;
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#endif
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#ifdef DEBUG
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printf("exec: file=%s loadaddr=0x%lx\n", file, loadaddr);
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#endif
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BI_ALLOC(5); /* ??? */
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BI_ADD(&btinfo_console, BTINFO_CONSOLE, sizeof(struct btinfo_console));
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io = open(file, 0);
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if (io < 0)
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goto out;
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/*
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* Read in the exec header, and validate it.
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*/
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if (read(io, (char *) &x, sizeof(x)) != sizeof(x))
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goto shread;
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magic = N_GETMAGIC(x);
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if ((magic != ZMAGIC) || (N_GETMID(x) != MID_MACHINE)) {
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#ifdef DEBUG
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printf("invalid NetBSD kernel (%o/%d)\n", magic, N_GETMID(x));
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#endif
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errno = EFTYPE;
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goto closeout;
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}
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entry = x.a_entry & 0xffffff;
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if (!loadaddr)
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loadaddr = (entry & 0x100000);
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cp = loadaddr;
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extmem = getextmem();
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#ifdef XMS
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if ((getextmem1() == 0) && (xmsmem = checkxms())) {
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u_long kernsize;
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/*
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* With "CONSERVATIVE_MEMDETECT", extmem is 0 because
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* getextmem() is getextmem1(). Without, the "smart"
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* methods could fail to report all memory as well.
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* xmsmem is a few kB less than the actual size, but
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* better than nothing.
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*/
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if (xmsmem > extmem)
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extmem = xmsmem;
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/* Approximate a size for the temporary buffer needed.
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* Can't calculate the real size right now because we don't
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* yet know the size of the stringtable. Overrunning the
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* temporary buffer doesn't break anything but DOS - which
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* isn't needed at that time any more. Usualy it even doesn't
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* harm DOS, because our buffer was the latest allocated and
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* is followed by free memory. */
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kernsize = x.a_text + x.a_data + x.a_bss + sizeof(x.a_syms);
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if (x.a_syms > 0)
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kernsize += x.a_syms + sizeof(cc);
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/* add a little for the string table, convert to kB rounding
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* up... */
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kernsize += (x.a_text + x.a_data) / 6;
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kernsize = (kernsize + 1023) / 1024;
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tmpbuf = xmsalloc(kernsize);
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if (!tmpbuf)
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return(ENOMEM);
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origadr = cp;
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cp = tmpbuf;
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}
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#endif
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/*
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* Leave a copy of the exec header before the text.
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* The kernel may use this to verify that the
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* symbols were loaded by this boot program.
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*/
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vpbcopy(&x, cp, sizeof(x));
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cp += sizeof(x);
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/*
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* Read in the text segment.
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*/
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printf("%ld", x.a_text);
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if (pread(io, cp, x.a_text - sizeof(x)) != x.a_text - sizeof(x))
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goto shread;
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cp += x.a_text - sizeof(x);
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/*
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* Read in the data segment.
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*/
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printf("+%ld", x.a_data);
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if (pread(io, cp, x.a_data) != x.a_data)
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goto shread;
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cp += x.a_data;
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/*
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* Zero out the BSS section.
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* (Kernel doesn't care, but do it anyway.)
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*/
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printf("+%ld", x.a_bss);
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pbzero(cp, x.a_bss);
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cp += x.a_bss;
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/*
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* Read in the symbol table and strings.
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* (Always set the symtab size word.)
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*/
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vpbcopy(&x.a_syms, cp, sizeof(x.a_syms));
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cp += sizeof(x.a_syms);
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if (x.a_syms > 0) {
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/* Symbol table and string table length word. */
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printf("+[%ld", x.a_syms);
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if (pread(io, cp, x.a_syms) != x.a_syms)
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goto shread;
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cp += x.a_syms;
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read(io, &cc, sizeof(cc));
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vpbcopy(&cc, cp, sizeof(cc));
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cp += sizeof(cc);
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/* String table. Length word includes itself. */
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printf("+%d]", cc);
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cc -= sizeof(int);
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if (cc <= 0)
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goto shread;
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if (pread(io, cp, cc) != cc)
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goto shread;
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cp += cc;
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}
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#ifdef XMS
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if (tmpbuf) {
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/* cp points into tmpbuf, convert end address to physical address */
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boot_argv[3] = (((u_int) (cp - tmpbuf + loadaddr) + sizeof(int) - 1)) & (-sizeof(int));
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printf("=0x%lx\n", cp - tmpbuf);
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} else {
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#endif
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boot_argv[3] = (((u_int) cp + sizeof(int) - 1)) & (-sizeof(int));
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printf("=0x%lx\n", cp - loadaddr);
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#ifdef XMS
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}
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#endif
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boot_argv[0] = boothowto;
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#ifdef COMPAT_OLDBOOT
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/* prepare boot device information for kernel */
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if (parsebootfile(file, &fsname, &devname, &unit, &part, &filename)
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|| strcmp(fsname, "ufs"))
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bootdevnr = 0; /* XXX error out if parse error??? */
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else {
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int major;
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if (strcmp(devname, "hd") == 0) {
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/* generic BIOS disk, have to guess type */
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struct open_file *f = &files[io]; /* XXX */
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if (biosdisk_gettype(f) == DTYPE_SCSI)
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devname = "sd";
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else
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devname = "wd";
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/*
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* The old boot block performed the following
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* conversion:
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*
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* hdN -> Xd0
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*
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* where X is the type specified by the label.
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* We mimmick that here, for lack of any better
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* way of doing things.
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*/
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unit = 0;
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}
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if (dev2major(devname, &major))
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bootdevnr = 0; /* XXX error out??? */
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else
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bootdevnr = MAKEBOOTDEV(major, 0, 0, unit, part);
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}
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boot_argv[1] = bootdevnr;
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#else
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boot_argv[1] = 0;
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#endif
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#ifdef PASS_BIOSGEOM
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bi_getbiosgeom();
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#endif
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boot_argv[2] = vtophys(bootinfo); /* old cyl offset */
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/*
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* boot_argv[3] = end (set above)
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*/
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boot_argv[4] = extmem;
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boot_argv[5] = getbasemem();
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close(io);
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#ifdef DEBUG
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printf("Start @ 0x%lx ...\n", entry);
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#endif
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#ifdef XMS
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if (tmpbuf) {
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/*
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* We know have done our last DOS IO, so we may
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* trash the OS. Copy the data from the temporary
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* buffer to its real adress.
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*/
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ppbcopy(tmpbuf, origadr, cp - tmpbuf);
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}
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#endif
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startprog(entry, 6, boot_argv, 0x90000);
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panic("exec returned");
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shread:
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printf("exec: short read\n");
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errno = EIO;
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closeout:
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close(io);
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out:
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BI_FREE();
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bootinfo = 0;
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return (-1);
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}
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